Ore grinder and amalgamator



No. s|`6,9|5. Patented 1an. s, |899.`

.1. eEnsTLE.

URE GRINIJEB ND AMALGAMATOR.-

(Application led Oct. 26, 1897.) (No Model.) 2 Sheets-Sheet I.

No. 6|6,9|5. Patented lah. 3, |899.

'.1. aEnsTLE. ons anmnemnn AmALaAmAToR.

(Appiimmn med occ. 2e, 1897.) l

2 Sheets-Sheet 2.

(No Model.)

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mins co. Pwcrau'ruo.. manina-ron, n. c. v

UNITED STATES PATENT EEICE.

JACOB GERSTLE, OF PORTLAND, OREGON.

ORE GRINDER AND AMALGAMATOR.

SPECIFICATION forming part of Letters Patent No. 616,915, dated January3, 1899.

Application led Octo'ber 26, 1897. Serial No. 656,430. (No model.)

To all whom t may concern,.-

Be it known that I, JACOB GERSTLE, a citi- Zen of the United States,residing at Portland, in the county of Multnomah and State of Oregon,have invented a new and useful Improvement in Ore Grinders andAmalgamators, of which the following is ,a specification.

The object of my invention is to provide a grinding or pulverizin gdevice for use in grinding or pulverizing ore and amalgamating theprecious metals with Quicksilver; and it consists in the constructionand arrangement of grinding-pan and pulverizing devices herein shown anddescribed whereby the work is accomplished very perfectly and with greatrapidity. l

Figure lis a side elevation; Fig. 2, a central vertical section. Fig. 2is a sectional detail showing the trailing grinding-shoe, and Fig. 3 aplan view with one-half of the rotating frame cut away.

A is a cylindrical pan having a cast-metal bottom A with depressions init in which are seated a series of dies or rubbing-surfaces A2,extending around in a circle at the lowest part of the bottom of thepan. The tops of these dies are ilush with the bottom of the pan,whichis curved in cross-section from the center outwardly. V

The pan is held stationary upon base-timbers, as shown, and .through thecentral hub A3 there extends the vertical shaft C, which at the upperend is rigidly keyed to a pendent circular frame D D' and at the lowerend revolves in a step-bearin g and has rigidly keyed to it a bevelgear-wheel C', which is driven by a smallerl bevel-gear B on adrive-shaft B, having a tight and loose pulley, as shown in Fig. 2. y

. E arek the grinding shoes, connected by hinged arms E to the revolvingframe D', and a a a2 are outlets for the ground ore and quicksilver.

The pan-bottom is curved in section, so that the pulp gravitates to themiddle line between the grinding-surfaces. In order that every particleof the pulp may be kept moving, so as to come under the shoes and comein contact with the quicksilver, there are Scrapers e and e for eachshoe, which Scrapers are shaped like plowshares. One of these, e',extends up along the conical hub of the pan and will continually loosenand bring down the pulp which generally collects near the center of thepan and around the middle hub, and the other'one, e, draws the pulp backfrom the outer edge of the pan. It will thus be seen that the pulp iskept in constant motion and cannot become compact by the heavier partsettling on the bottom. The main advantage, however, from thisarrangement is that in this way the larger and heavier particles of thepulp are kept in constant motion and brought under the action of thegrinding-shoes and are ground up, and thus the gold is freed andprecipitated to the bottom and caught by the quicksilver.

With respect to the arms E that hold the shoes I would state that thesearms if made stiif do not yield and as the pulp gets lower or the shoesget worn the pressure is reduced. There is in suchcase only one of twothings to be done-either the shoes have to be renewed every little whileor more pulp put in in order to keep up an even pressure. Hence the armE is joined by hinges (see Fig. 2n) and is set at a slight angle to thevertical, so as to drag. There is also an eye e2, from which weights areto be hung, as shown in dotted lines in Fig. 2, which overcomes thisdefect, for as the shoes get thinner or the pulp less a larger weight isadded, and in this way an even pressure is kept up. Instead of the shoeshaving to be renewed every little while they can be used until wornquite thin, for the pressure is maintained just the same.

The dies A2 form a detachable bottom to the pan and are seated inarecess in the bottom of thepan with their upper faces iiush with thecurved bottom. They are sojoined that a section may be removed at onetime. This is done when cleaning out the quicksilver. By sucharrangement this is rapidly done and greatly facilitates making repairs.

The wear and tear, owing to the curved bottom and general constructionof the dies, hanging of the shoes, dto., is reduced to the minimum. Inmost mills and pans the wear runs from twenty-five to fifty cents perton. My pan will not average over one cent per ton, which involves avery great saving.

The pulp to be used must be crushed to a forty-mesh fineness,`and thepan will hold from one to one and a half tons and run it out in from one and a half to two and a half hours, according to the ore. rlhecontents of the pan can be easily discharged by means of the waste-pipesa d CL2 on the side of the pan. The highest one is to run off the top,and as the pressure is reduced and contents lessened the next one isopened. The lowest one is to let off the Quicksilver after the dies havebeen removed. The machine is kept revolving while being discharged, andin this way every particle is cleared out. Tater may be turned in toflush out, if necessary.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

An ore grinder and amalgamator consisting of a pan having a concavebottom A rising in the center in the form of a conical hub, and havingan annular recess at its lowest point containing detachable flush-laiddies A2, a superposed rotating frame D D', inclined and pivoted trailingarms E having shoes E at their lower ends, said shoes being providedeach with an outer scraper c and an inner scraper e', and 'outlets a, da? for the Water and material substantially as shown and described.

JACOB GERSTLE; Vitnesses:

C. A. VARNY, W. II. MERCER.

